INVOIC02 iDod with Down Payment and BillingPlan

[andreasbuchholz2021]

Hi Experts,

we are integrating SAP SD Billing with Peppol Network/ eInvoice 3.0. Therefore we are using INVOIC02 iDoc as basis. We have Business cases with downpayment/ billingplan and final invoices. Infact the final invoice has serious issues in integration as the 'amouts payed' is designed as separate billing item which "understands" the eInvoice Standard as own item. Besides of that eInvoice wants to have the "amounts payed" on header level which is not compatible to the billg plan design is SAP with AZWR conditiontype. 

Any ideas? Is there an extension/ functionmodue available to implement this changes in iDOc or a different messagetype?

Regards

Andreas